Reference,Channel,Value,Tolerance,Footprint,Manufacturer Part Number,Qty,Why / Notes
U1,MID amp,LM3886TF,—,TO-220-11 isolated,LM3886TF/NOPB,1,Mid power stage; isolated tab eases chassis mount. VERIFY mute pin vs datasheet
U2,HF amp,LM3886TF,—,TO-220-11 isolated,LM3886TF/NOPB,1,HF power stage (lower average power)
U3,XO,OPA2134PA,—,DIP-8,OPA2134PA,1,Stages HP1+HP2 (or LP1+LP2) — dual op-amp
U4,XO,OPA2134PA,—,DIP-8,OPA2134PA,1,Remaining two Sallen-Key stages
U5,Input,INA134PA,—,DIP-8,INA134PA,1,Balanced line receiver (alt THAT1200). VERIFY pinout
U6,PSU,+15V reg,—,TO-220,LM7815CT/NOPB,1,XO/op-amp positive rail
U7,PSU,-15V reg,—,TO-220,LM7915CT/NOPB,1,XO negative rail — pinout ≠ 7815
Cin_M,MID,1uF 63V PP film,5%,THT 5mm pitch,Panasonic ECQ-E1105JF,1,Blocks DC into mid +IN
Rin_M,MID,1k,1%,axial MRS25,Vishay MRS25000C1001FCT00,1,Series input R
Rbias_M,MID,1M,1%,axial,Vishay MRS25000C1004FCT00,1,Bias path for +IN
Rf_M,MID,20k,1%,axial,Vishay MRS25000C2002FCT00,1,Feedback → gain 21 with Ri
Ri_M,MID,1k,1%,axial,Vishay MRS25000C1001FCT00,1,Gain set
Cf_M,MID,20pF C0G,5%,0805,Kemet C0805C200J5GACTU,1,Stability / RF roll-off on feedback
Ci_M,MID,220uF 25V FR,20%,radial 5mm,Panasonic EEU-FR1E221,1,AC-grounds Ri (DC gain=1)
Rz_M,MID,10R 0.5W,1%,axial PR01,Vishay PR01000101000JR500,1,Zobel with Cz
Cz_M,MID,0.1uF 100V film,5%,MKS2,WIMA MKS2B041001H00KSSD,1,Zobel
Lout_M,MID,0.68uH,10%,axial,Bourns 78F680J-RC,1,Cable isolation
RLp_M,MID,10R 0.5W,1%,axial,Vishay PR01,1,Damps Lout
Rmute_M,MID,100k,1%,axial,Vishay MRS25000C1003FCT00,1,Mute delay with Cmute
Cmute_M,MID,10uF 50V,—,radial,Panasonic EEU-FR1H100,1,~1s thump mute
CdecP_M,MID,100nF 50V X7R,—,0805,Murata GRM21BR71H104KA01L,1,+V pin bypass
CdecN_M,MID,100nF 50V X7R,—,0805,Murata GRM21BR71H104KA01L,1,-V pin bypass
CbulP_M,MID,1000uF 35V FR,—,radial 5mm,Panasonic EEU-FR1V102,1,Local reservoir
CbulN_M,MID,1000uF 35V FR,—,radial 5mm,Panasonic EEU-FR1V102,1,Local reservoir
Cin_H,HF,1uF 63V PP,5%,THT,Panasonic ECQ-E1105JF,1,HF amp input couple
Rin_H,HF,1k,1%,axial,Vishay MRS25000C1001FCT00,1,
Rbias_H,HF,1M,1%,axial,Vishay MRS25000C1004FCT00,1,
Rf_H,HF,20k,1%,axial,Vishay MRS25000C2002FCT00,1,Same gain 21; level via pad
Ri_H,HF,1k,1%,axial,Vishay MRS25000C1001FCT00,1,
Cf_H,HF,20pF C0G,—,0805,Kemet C0805C200J5GACTU,1,
Ci_H,HF,220uF 25V FR,—,radial,Panasonic EEU-FR1E221,1,
Rz_H,HF,10R 0.5W,1%,axial,Vishay PR01,1,
Cz_H,HF,0.1uF film,5%,MKS2,WIMA MKS2,1,
Lout_H,HF,0.68uH,—,axial,Bourns 78F680J-RC,1,
RLp_H,HF,10R 0.5W,1%,axial,Vishay PR01,1,
Rmute_H,HF,100k,1%,axial,Vishay MRS25,1,
Cmute_H,HF,10uF 50V,—,radial,Panasonic EEU-FR1H100,1,
CdecP_H,HF,100nF,—,0805,Murata,1,
CdecN_H,HF,100nF,—,0805,Murata,1,
CbulP_H,HF,1000uF 35V,—,radial,Panasonic EEU-FR1V102,1,
CbulN_H,HF,1000uF 35V,—,radial,Panasonic EEU-FR1V102,1,
Rpad1,HF pad,5.6k,1%,axial,Vishay MRS25000C5601FCT00,1,Series attenuator (~−6 dB with Rpad2)
Rpad2,HF pad,5.6k,1%,axial,Vishay MRS25000C5601FCT00,1,Shunt to GND after series — ratio ≈ 0.5 (−6 dB). Tune in QC
Rhp1_a,XO HP1,6.8k,1%,axial,Vishay MRS25000C6801FCT00,1,fc=2.5kHz stage1 — from calculator
Rhp2_a,XO HP1,13.6k (6.8k+6.8k),1%,axial,2× MRS25000C6801FCT00,2,Exact 2·R1 for Butterworth Q
Chp1_a,XO HP1,6.8nF PP/C0G,5%,THT/0805,WIMA FKP2 6.8nF,2,C1=C2=6.8nF
Rhp1_b,XO HP2,6.8k,1%,axial,Vishay MRS25000C6801FCT00,1,Identical stage2 → LR4 HP
Rhp2_b,XO HP2,13.6k,1%,axial,2×6.8k series,2,
Chp1_b,XO HP2,6.8nF,5%,film,WIMA FKP2,2,
Rlp1_a,XO LP1,3.0k,1%,axial,Vishay MRS25000C3001FCT00,2,R1=R2=3k
Clp1_a,XO LP1,15nF PP,5%,film,WIMA MKS2 15nF,1,C1
Clp2_a,XO LP1,30nF (2×15nF),5%,film,2× WIMA 15nF,2,Exact 2·C1
Rlp1_b,XO LP2,3.0k,1%,axial,Vishay MRS25000C3001FCT00,2,Identical → LR4 LP
Clp1_b,XO LP2,15nF,5%,film,WIMA,1,
Clp2_b,XO LP2,30nF (2×15nF),5%,film,2×15nF,2,
Cdec_op,XO,100nF 50V,—,0805,Murata GRM21,4,At each OPA2134 supply
Rmaster,Front,10k log dual,—,panel,Bourns PDB181-GTRB01-104A2,1,Master level after balanced RX
Rhftrim,Front,10k log,—,panel,Bourns PDB181,1,HF trim (optional across pad)
J1,Panel,XLR/TRS combo,—,Neutrik,NCJ6FI-S,1,Balanced input
IEC1,Panel,IEC C14 filtered,—,Schaffner,FN9222-3-06,1,Fused inlet
SW1,Panel,DPST rocker,—,Carling,DPST,1,
T1,PSU,2×22VAC 200VA toroid,—,Antek,AN-2220,1,VERIFY primary for local mains
BR1,PSU,25A bridge,—,Vishay,GBPC2502-E4,1,
CrawP,PSU,10000uF 50V FR,—,radial,Panasonic EEU-FR1H103,2,+ raw (parallel OK)
CrawN,PSU,10000uF 50V FR,—,radial,Panasonic EEU-FR1H103,2,- raw
Cout15P,PSU,100uF 25V+100nF,—,radial+0805,Panasonic EEU-FR1E101L,1,7815 output
Cout15N,PSU,100uF 25V+100nF,—,radial+0805,Panasonic,1,7915 output
F1,PSU,T2A H 250V fuse,—,5×20,Littelfuse 0218002.MXP,1,VERIFY for 120V lands
LED1,Panel,Green 3mm + 4k7,—,3mm,Kingbright,1,Power on
PCB1,Fab,CAMS-XO-R1,2-layer FR4 1.6mm 1oz,100×80 mm,JLCPCB,1,Active XO + input
PCB2,Fab,CAMS-AMP-R1,2-layer FR4 2oz preferred,120×100 mm,JLCPCB,1,Dual LM3886
HS1,Mech,Heatsink mid,≤0.8 K/W,TO-220 multi,Fischer SK81 / Aavid,1,
HS2,Mech,Heatsink HF,—,TO-220,Aavid,1,